Per holmberg



No. 610,745. Patented Sept. |3,'l898. P. HOLMBERG, ADJUSTING ARRANGEMENT FOR SPRING POWER HANMERS, &c.

(No Model.)

I I'I llni'rnio STATES PER HOLMBERG, OF LJUSNE, SWEDEN, ASSIGNOR TO THE LJUSNE XVOXNA AKTIEBOLAG, OF SAME PLACE.

ADJUSTING'ARRANGEMENT FOR SPRING-POWER HAMMERS, 80C.

SPECIFICATION forming part'of Letters Patent No. 610,745, dated. September 13, 1898.

A nano filed March 3,1898. seen a. 672,357. on man.)

T0 ail whom it may concern:

Be it known that I, PER HOLMBERG, ironturner, a subject of the King of Sweden and Norway, and aresident of Lj usne, in the Kin gdom of Sweden, have invented certain new and useful Improvements in Adjusting Arrangements for Spring-Power Hammers and Similar Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to an arrangement by means of which the length of the stroke of spring-power hammers and similar machines can easily be adjusted while the machine is running.

Figure 1 shows a hammer of this kind, viewed from one side and partly in section; and Fig. 2 shows a transverse section of the same. Fig. 3 shows a modification.

The hammer is composed, as usual, of a frame a, an anvil b, a hammer-head c, a lever cl, to which the hammer-head is attached by means of the spring 2, and a crankshaft f, acting on the lever. In the plane'of the lever (i there is supported in the frame a a ring g of comparatively large diameter, through which ring the crank-shaft f passes. To the ring is jointed an arm 71., which is connected to the crank of the shaft f by being provided with aslot 7c, in which reciprocates during the rotation of the crank a journal-box or sliding block embracing the crank. The arm h,which is by this means given an oscillating movement, is finally connected to the lever 61 by means of the links m. The length of the stroke is adj nsted by revolving the ring. If the ring be rotated toward the right, Fig. 1, the angle formed between the arm h and the perpendicular through the shaft f will be decreased. The stroke of the arm h, and consequently that of the lever and the hammerhead, will thus be smaller. When rotating the ring toward the left, the angle mentioned will increase and the stroke of the arm and the hammer-head will be greater. For revolving the said ring various arrangements may be employed. In the drawings the ring is provided with teeth, with which engage two pins n, that act as a pinion, the pins being attached to a common center piece, the

shaft 0 of which is provided with a crankhandle 19. An additional advantage of the construction'described is that the hammerhead ascends slowly and descends quickly, as the crank at the rotation of the shaft f in the direction of the arrow, Fig. 1, acts on the outer part of the arm h when the hammerhead ascends, but on the inner part of the arm when the hammer-head descends.

In order to allow of raising and lowering the hammer-head to suit different thicknesses of the work-pieces, the rear end of the lever cl is attached to a worm-wheel sector r, mounted on the frame and engaging with a worm 5. By turning a handle attached to the latter the joint of the sector and lever may be raised or lowered.

The construction described may be somodified that instead of the ringg a crank may be used for moving the fulcrum of the arm h. This arrangement is shown in Fig. 3. On the shaft f is carried the crank 7L2, from which the arm it extends in the same manner as from the ring. If the crank h be turned, the said crank for this purpose being provided with a special crank h a hand-wheel, or the like, the fulcrum of the arm h will be moved in the same manner as by means of the ring. The crank it remains stationary, while the shaft f revolves." It is also possible to employ interrupted crank-shafts j ournaled in the same line, one of them, f, at one side of the ma chine and the other, h at the other. This arrangement, however, will not be as durable as that with through-cranks describedabove. The adjusting arrangement above described may evidently be employed also in other machines having a motion similar to that above referred to.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is-- I 1. The combination in a spring-power hammer with the hammer-lever and actuatingcrank, of a slotted arm upon which the crank acts, links connecting the slotted arm with the hammer-lever, and a pivotal support for one end of the slotted arm and means for adjusting the same in an arc of a circle around the crank-shaft and varying the throw of the hammer, substantially as specified.

2. The combination in a spring-power hammer with the hammer-lever and actuatingcrank, of a slotted arm upon which the crank acts, links connecting the slotted arm with the hammer-lever, a ring and its support around the crank-shaft, a pivotal connection between the ring and slotted arm and means for turning the ring around and varying the throw of the hammer, substantially as specified.

3. The combination in aspring-powerhan1- mer with the hammer-lever and actuatingcrank, of a slotted arm upon which the crank acts, links connecting the slotted arm with the hammer-lever and a pivotal support for one end of the slotted arm and means foradj ustin g the same in an arc of a circle around the crank-shaft and varying the throw of the hammer, a sector and pivotal connection thereto of the hammer, and means for adj usting such sector and pivot to raise or lower the hammer-head, substantially as specified.

4. The combination in a spring-power hammer with the hammer-lever and actuatingcrank, of a slotted arm upon which the crank acts, links connecting the slotted arm with the hammer-lever, and a pivotal support for one end of the slotted arm and meansfor adj usting the same in an arc of a circle around the crank-shaft and varying the throw of the hammer,a worm-wheel sector and pivotal connection thereto of the hammer and a wormpinion for adjusting such sector and pivot to raise or lower the hammer-head, substantially as specified.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

PER HOLMBERG.

Witnesses:

ERNST SVANQVIST, E. HERMANSSON. 

